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Another Accessibility Design Issue

>>> EDIT: Problem has been resolved. Thread can be closed if admins wish to <<<

I've got a form with a file field (input box with a "Browse" button) and a submit button (with a name, say "submit").

When the form submits, it calls itself and the PHP script checks if $submit has a value. If it does, it process the form (uploads the file to the server). It works fine, except I'm having a problem getting it to work with Access Tech Equipment. The script isn't assigning $submit a value when using the equipment and submitting the form. I thought the problem would be that if you don't actually press the button the $submit variable won't receive a value, so I changed the form action to file.php?submit=yes and the same error occurs... the page is erroring out when it checks if $submit has a value

PHP Code:

if($submit) {
--- do stuff here ---
} else {
echo "Error occured";
}

The "Error occured" message keeps displaying which would mean that $submit isn't receiving a value -- but it works fine if you submit the form normally (without Access equpiment)... any ideas on why this would occur?